Shunt resistance type current sensor

A shunt resistance type current sensor, comprising:

• a bus bar of a substantially flat plate shape;
• a shunt resistance part provided in the bus bar;
• a circuit board which is disposed so as to oppose the bus bar;
• connection terminals which electrically connect between the bus bar and the circuit board;
• and
• a voltage detector which is mounted on the circuit board and detects a voltage applied to the bus bar in order to detect a magnitude of current to be measured flowing through the bus bar, wherein
• each of the connection terminals is formed integrally with the bus bar as an extending piece extended from an edge part of the bus bar and provided in a respective positions corresponding to both ends of the shunt resistance part, an area of the connection terminal reduced in its plate thickness than a plate thickness of the bus bar is set in a predetermined range from a tip side of the connection terminal, and the tip side of the connection terminal penetrates the circuit board and thus the connection terminal is connected to the circuit board.